Wheel-dressing mechanism



A. E. LARSSON.

WHEEL DRESSING MECHANISM.

APPLICATION FILED MAR. Is, 1918.

l 5,42%;765, Patented. Aug. 8, 1922.

I I I A. E. LARSSON. WHEEL DRESSING MECHANISNI.

APPLICATION FILED MAR. I5, 1918.

1,424,765., Patented Aug. 8, 1922.

2 SHEETS-SHEET 2.

IIIIIIIIIIII-II f ORA/EV Nrs feras reir er.

ANDERS n LANssoN, or Hammam, CONNECTICUT, NssIeNoa 'ro raam* a WHITNEY;

COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW ERSEY.

WHEEL-DRESSING NnCHANisN.

Specification of Letters Patent.v

Application led March 16, 1918. lSselilalll'o. 222,929. C

To all vwhom t may concer/n.: i

Be it known that I, ANDERS E. LARssoN, a

citizenM of the United States, residing at.

Hartford, in the county of` Hartford and- State of Connecticut, have invented certain new and 4useful Improvements in Wheel- Dressing Mechanism, of whichthe following is a specification.

The object of the invention is to provide a wheel dressing mechanism which is particularly adapted for use in connection with-or as'a part of a' thread grinding machine of the type set forth in my copending application Serial No. 222,928, filed on even date herewith. It will be understood, however, that the present invention is not lii'nited for use with the 4s'aid threadgrinding machine. In accordance with the invention, I provide two dressing tools which are independentlyr mountedv and independently operable, the supports for these tools being adjustable to permit the lines of movements of the tools to be angularly adjusted. A further object of the invention is to 'provide improved means whereby. the wheel dressing mechanism as a whole may be adjusted with respect to the grinding wheel. Further objects of the invention will be apparent from the following specification and claims.

In the accompanying drawings I have shown two embodiments of the invention; but it will be understood that the drawings are intended merely for the pu-rpose of illustration and are not intended to define or limit the scope of the invention, the accompanying claims being relied upon for that purpose.

Of the drawings:

Fig.- 1 is a plan view showing a wheel dressing mechanism embodying the invention. a plied to a grinding machine of the type s own in my aforesaid copending application. The grinding machine is not shown in its entirety as many of the parts are not directly involved in the present invention.

Fig. 2 is a front elevation, partly in section, along the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary plan view similar to Fig. 1 but showing another embodiment of the invention.

The grinding machine to which the wheel dressing mechanism is .applied @mprises a main frame-1' upon which is supported al longitudinally movable table 2. rlhis t'able carries a headstock 3.and a tailstock 4 having centers which support a blank to be ground.

The blank is shown as being an internal thread gage A. The' grinding wheel is indlcated' at 5, and this is positioned'to engage the threads ofthe blank A. By means Patented Aug'. 8, 11922..

of suitable mechanism not fully shown, the

blank is rotated first in one direction and then in the other, the table 2 being reciprocated in synchronism to enable the wheel to follow the thread convolutions. rlhe wheel ismounted on a carriage 6 which is'transversely movable along ways 7 and 8 formed on the main frame. iBy means of suitable mechanism, not shown, the carriage isY moved forward to bring the wheel into engagement with the blank at the beginning of movement in one direction and the carriage is moved backward to disengage the wheel from the blankat the beginning of movement in the other direction.

,The grinding wheel 1s preferably mounted on the carriage in the following manner.

bracket 9 projects upward from the carriage and a Aplate l0 is secured to the bracket. The plate 10 carries bearings 11 and 12in which is rotatably mounted a spindle 13 carrying the wheel 5. The plate 10 is angularly adjustable, with respect to the bracket 9, about a transverse horizontal axis which preferably passes through the center of the grinding wheel. As shown, the plate 10 is provided with two arcuate slots 14 and l'through which extend bolts 16 and 17 secured to the bracket 9. By loosening the nuts on these bolts thel plate can be adjusted to position the wheel 5 at any desired angle to conform to the angular pitch of the threads to be ground. After adjustment the plate 10, together with the spindle and. the

wheel, can be locked in adjusted .positions by tightening the nuts on the bolts. Preferably a scale 18 is provided to show-the ad'ustment of the wheel. p

ecured to the end of the spindle 13 opposite to the. wheel is a belt ulley 19 and this pulley is engaged by a elt 20 which passes over a pulley 21 at' the rear of the carriage 6. The pulley 21 is mounted on a short horizontal shaft which also carries a belt pulley 2 2, By means of a belt engaging the pulley 22 power is transmitted for rotatin the grindmg wheel.

The 'carriage 6 has a bracket 23 Whlch projects laterally therefrom at the rear of the wheel and which serves as a support and guideway for a carrier slide 24 lmovable forward, and backward along lines arallel to Ithe central plane of the Wheel. y means of bolts 25 the slide may be secured in adone side, as for instance at the left-hand side,

the plate 26 has an arcuate groove 28 constructed about the center 27. A plate 29 rests upon the plate 26 and has an arcuate tongue 27a which fits the groove 28. It will be seen that the plate 29 may be angularly adjusted about the center 27, being guided by the walls of the groove 28 durmg such movement. A scale 30 is provided on the plate 26 for indicating the angular ad `us t ment of the plate 29. A bolt 3l rojects downward from the late 29 through a slot 32 in the plate 26. y means of this bolt the plate 29 can be secured in adjusted position.

Formed on the top of the plate 29 is a guideway for a slide 33 which can be moved under the control of a screw carrying a handle 34. Formed onthe top of the slide 33 is a guideway for a slide 35 which can be lmoved under the control of a screw Ycarrying .a handle 36. The two slides 33 and 35 are movable at right angles to each other. The slide 35 carries a suitable dressing tool .37. I have shown a diamond pointed tool,

but it will be understood that the invention is not so limited.

At its opposite side the plate 26 carries a plate 38 which is similar to the plate 29 and which is similarly sup orted and guided. The plate'26 is providedp with a scale 39 for indicating the angular adjustment of the plate 38. Carried by the plate `38 is a slide 40 controlled by a screw having a handle 4l. Carried by the slide 40 is a slide 42 controlled by a screw having a handle 43. The slides 40 and 42 are similar respectively to the slides 33 and 35. The slide 42 car-` ries a dressing tool 44 similar to the tool 37.

If desired the dressing tools such as the diamond tools 37 and 44 or the rotating dressing wheels 37 a and 44L may be mounted on the lower slides 33 and 40 and guided forward and backward over the surface of the wheel 5 by any suitable guiding means. These guiding means may be in the form of sliding plates similar to 35 and 42 without the screws 36 and 43 so'that they may be operated readily by hand or any other means permitting the dressing tools to be moved in'a direction at right angles to the dlrection of movement of the slides 33 and 40.

Obviously any means constraining the dressapproximately vertically beneath the 'rear edge of the wheel, so that the center 27 will lie approximately in a vertical axis which is tangent to the periphery of the wheel. Then the plates 29 and 38 are angularly adjusted so as to bring the slides '35 and 42 at the proper angles to the central plane of the wheel. Ordinarily both slides are placed at an angle of 30, this angle being read directly on the scales 30 and 39. Then one of the slides, as for instance 33, is adjusted to move the dressin tool 37 into position to engage the edge of the wheel. By means ofthe screw 36 the slide 35 is then moved forward or backward tol move the dressing tool along the wheel and pro erly dress one side thereof. -Then the ot eritool 44 is brought into operative relation to the wheel by means of the slide 40 and is moved forward and backward by means of the slide 42. After the wheel has been properly dressed the two slides 33 and 40 are moved backward to withdraw the tools from engagement with the wheel. Preferably the screws for the two slides carry respectively scales 44 and 45 which enable the operator to restore the slides to their former posi.

tions, when it again becomes necessary to dress-the wheel.

It will be seen that, inasmuch as the dressing tools are at the back ofthe wheeland directly opposite the points of engagement between the wheel and the work, they automatically l compensate for errors which would otherwise arise because of angular adjustment of the wheel. f

The constructionvshown in 3 Ais simi-v lar to that shown in Fig. 1 except that different tools are used for dressing the wheel. In place of the diamond pointed tools 37 and 44` I provide rotary wheels 37a and 44a of suitable materiali The wheels are carried respectively by the slides 35 and 42. Each wheel is mounted on a spindle 46 rotatable in suitable bearings in a bracket 47. Carried by each spindle 1s a belt pulley 48 adapted to be enga ed by a suitable round belt, notl shown. referably each bracket 47 is adjustably mounted on the correspond ing slide. lAs shown, the bracket has an in.` tegral arm 49 which extends tical Stem 50. The stem is adjustably through a ver- Lezama the slide. rl`his construction permits the bracket 47, with the spindle and the wheel, to be adjusted with respect to the slide in either direction, as required.

It will be obvious that the manner of use of the mechanism shown in F ig. 3 is similar to that already described in connection with the mechanism shown in Figs. l and 2.

Throughout the foregoing specification and in the claims which follow, use is made of the terms horizontal and vertical. It will be understood that these terms are used merely for the purpose of indicating the` relation between the parts and are not to be construed strictly as limiting the positions of the parts.

l/Vhat I claim is:

l. A mechanism for dressing the grinding y along lines at an angle to the lines of movement of the carrier slide, and means on said latter slide permitting a dressing tool to engage and dress a grinding wheel, along a line at right angles to the direction of movement or said latter slide.

2. A mechanism for dressing the grinding wheel of a grinding machine, comprising a 'carrier slide movable forward and backward along lines parallel to the central plane cf the wheel, a slide adjustable about an axis normally approximately tangent to the periphery of the u heel and mounted on the carrier slide, said second slide being movable to either side of the center line thereof and movable toward and from the wheel along vlines at an angle to the lines of movement of the carrier slide, a slide mounted on the second slide and movable at right angles thereto,jand a dressing too-l carried respectively by the last mentioned slide and adapted to engage the grinding wheel to dress it.

3. A mechanism for dressing the grinding wheel of a grinding machine, comprising a carrier slide movable forward and backward along lines parallel to the cent-ral plane of the wheel, two slides adjustable about an axis normally approximately tangent to the periphery of the wheel. and mounted on the carrier slide at opposite sides of the center line thereof and each movable toward and from the wheel along lines at an angle to the lines of movement of the carrier slide, two slides mounted respectively on the second slides and movable at right angles thereto and dressing tools carried respectively by the third slides and ea'ch adapted to engage the grinding wheel to dress it.

4t. A mechanism for dressing the grinding wheel of a grinding machine, comprising a carrier slide movable forward and backward along lines parallel to the central plane of the wheel, 'two slidesl adjustable about an axis normally approximately tangent to the periphery of the wheel and mounted on the carrier slide at opposite sides of the center line thereof and each movable toward and from the wheel along lines at an angle to the lines of movement of the carrier slide, two slides mounted respectively on the second slides and movable at right angles thereto, and rotatable abrasive wheels carried respectively by the third slides and each adapted'to engage the grinding wheel to dress it.

5. A mechanism for dressing the grinding wheel of a grinding machine, comprising a carrier slide movable forward and backward along lines parallel to the central plane of the wheel, two slides mounted on the carrier slide at opposite sides of the center line thereof and independently adjustable angularly about a common vertical axis, each slide beingv movable toward and from the wheel along lines at any desired angle to the lines of movement of the carrier slide, two slides mounted respectively on the second slides and movable at right angles thereto, and rotatable abrasive wheels carried respectively by the third slides and each adapted to engage the grinding wheel to dress it.

In testimony whereof, l hereto ailix my signature.

ANDERS E. LARSS-N. 

